Airis Sovereign of the North

Legendary Resistance (2/Day). If the half dragon fails a saving throw, it can choose to succeed instead.

Multiattack. Aris makes two Storm Bolts or one Storm Bolt + one Frost Claw

Storm Bolt (Ranged Spell Attack). Spell Attack: +10 to hit, reach 5 ft., one target. Hit: 11 (4d8) lightning damage

Frost Claw (Melee). Melee Attack: +8 to hit, reach 5 ft., one target. Hit: 11 (4d8+6) cold damage

Lightning Breath (Recharge 6). The dragonborn exhales blue and white lightning in a 30-foot line. Each creature in that area must make a DC 18 Dexterity saving throw. On a failed save, the creature takes 45 (10d8) lightning damage and is stunned until the creatures next turn. On a successful save, the creature takes half as much damage and isn’t stunned. 

 Spellcasting. The champion casts one of the following spells, using Charisma as the spellcasting ability (spell save DC 18):

1st level Spells 

4/day each: mage armor, chromatic orb, ice knife, Shield

 2rd level Spells

3/day each: mirror image, misty step, hold person, shatter

 3rd level Spells

3/day each: lightning bolt, sleet storm, counterspell, haste

 4th level Spells

1/day each: ice storm, storm sphere, greater invisibility

 5th level Spells

1/day each: cone of cold, hold monster

6th level Spells

1/day each: chain lightning

Storm Step. Teleport 30 ft in a crack of lightning leaving behind a lingering spark that lasts till Airis next plus next creature entering that space takes 2d8 lightning

Static Reversal. When hit by an attack deal 3d8 lightning damage back to attacker and push attacker 10ft

Spark Lash. Deal 2d8 lightning to a nearby target

Freeze Moment (Costs 2). Force one creature to make a Wis save (DC 16) or have disadvantage on next attack/save

Storm Collapse (Costs 3). AOE (15 ft radius) with a 60ft range causing 4d8 lightning + 4d8 cold and Knocks prone any creature in the area.